Description:
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On non-ZTS builds, PHP segfaults if opcache.interned_strings_buffer=0. This is because bult-in initialisation assumes that the PHP interned_string pool can be succcessfully copied to SHM.
As with the opcache.memory_consumption and opcache.max_accelerated_files INI parameters, opcache.interned_strings_buffer should have a validated minimum. In this case of 1 (Mb).
Test script:
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php56 -d opcache.enable=1 -d opcache.enable_cli=1 -d opcache.interned_strings_buffer=0 -r ''
Expected result:
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PHP should gracefully handle any valid INI parameter
Actual result:
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You get a Segfault.